DS3 is 44.7 Mbps and a T1 is 1.55 Mbps. So 1 DS3 = 28 T1s
http://www.dslbroker.com/ds3.html
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An OC-12 has 4 x OC3. An OC3 has 2 x DS3. In total, there will be 12xDS3 in one OC12.
A T1 is copper, and OC3 is fiber optic, so there is no way to make a T1 into OC3. Speed on a T1 is 1.544 Mbps, and speed on the OC3 is 155.52 Mbps, so in rounding, you need 100 T1 lines to equal the...
A DS3 can do 45Mbps Bidirectional Simultaneously.That is 5.63 MBps
24 DSOs of 64kbps each make up a T1 line.